https://demensdeum.com/demos/FlutDataStream/demo.mp4

A Flutter application that converts any file into a series of machine-readable codes (QR & DataMatrix) for high-speed data streaming between devices.

• Dual Encoding: Presents each data block as both a QR Code and a DataMatrix code simultaneously.
• High-Speed Streaming: Supports an automatic switching interval as fast as 330ms.
• Intelligent Chunking: Automatically splits files into configurable chunks (default: 512 bytes).
• Verbose Scanner: Real-time ASCII readout of the currently scanned code for debugging and immediate feedback.
• Automatic Reconstruction: Instantly reconstructs and saves files to the downloads directory.
• System Integration: Automatically opens the saved file using the default system application upon completion.

1. Make sure you have Flutter installed on your system

   flutter --version

2. Install dependencies

   flutter pub get

3. Run the app

   flutter run

1. File Selection: Choose any file from your device.
2. Chunking: The file is split into chunks (default: 512 bytes).
3. Encoding:
   • A Header Block is generated with file metadata (name, size, total block count).
   • Multiple Data Blocks are generated for the actual content (Base64 encoded).
4. Data Transmission:
   • Cycle through codes manually or use Auto Switch (default: 330ms) to "stream" the data to another device's camera.
5. Collection & Reconstruction: The receiving device scans all blocks (including the header) and automatically saves and opens the reconstructed file.

The protocol uses a pipe-separated format for reliability and efficient parsing.

FlutDataStreamHeaderBlock|{"fileName":"example.txt","fileSize":12345,"totalBlocks":7,"blockSize":512}

FlutDataStreamBlock|1|[base64 encoded data]
FlutDataStreamBlock|2|[base64 encoded data]
...

• qr_flutter: QR code generation
• barcode_widget: DataMatrix code generation
• mobile_scanner: High-performance camera scanning
• open_filex: Cross-platform file opening
• file_picker: File selection from device
• path_provider: File system access
• permission_handler: Android/iOS permission management

• Android
• iOS
• Windows
• macOS
• Linux
• Web

• txqr
• qram
• qrfontain